Skip to main content

Use of Gas-Permeable Membranes for the Removal and Recovery of Ammonia from High Strength Livestock Wastewater

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

The recovery of nitrogen (N) from wastes is important in agriculture because of the high cost of commercial N fertilizers. We investigated the use of gas-permeable membranes to capture and recover ammonia from high strength swine wastewaters. The new process includes the passage of gaseous (or free) ammonia (NH3) through a microporous hydrophobic membrane and capture and concentration in a stripping solution on the other side of the membrane. Membrane manifolds are submerged in the liquid and the free ammonia (NH3) is removed from the liquid before it escapes into the air. The concept was tested using concentrated swine manure effluents containing 140 to 1,400 mg/L NH4-N. The use of gas-permeable membranes to remove ammonia from liquid manure was effective, and the rate of N recovery by the gas-permeable membrane system was higher with higher ammonia concentration in the manure. While ammonia gas passed readily through the membrane pores, the soluble COD compounds did not pass. The rate of ammonia recovery was also increased with increased pH of the wastewater. With a pH of 8.3, the rate of N recovery was about 1.2% per hour. This rate was increased 10 times (to 13% per hour) at pH of 10. For liquid manure containing 1,400 mg/L NH4-N, with the membrane manifold installed, in 9 days the total NH4-N concentration decreased about 50%, from 1,290 mg/L to 663 mg/L. As a result, the NH3 fraction in the liquid, which is linked to ammonia emissions, decreased 95%, from 114.2 to 5.4 mg/L. By using the same stripping solution in 10 consecutive batches treating raw swine manure, the recovered N was concentrated in a clear solution containing 53,000 mg/L NH4-N. The results obtained in this study show that the use of gas-permeable membrane technology could be an effective approach to recover ammonia from livestock wastewater. The final products are (1) reduced environmental emissions from livestock facilities and (2) concentrated liquid nitrogen that can be re-used in agriculture as a valued fertilizer.

Keywords: Gas-permeable membranes; ammonia recovery; high strength wastewaters; nutrient recovery

Document Type: Research Article

DOI: https://doi.org/10.2175/193864711802867405

Publication date: 2011-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more